- WEB EXCLUSIVE
- PE COFFEEHAUS
The agency also is issuing an interim health advisory of 15 parts per billion (ppb) to assist state and local officials in addressing local contamination of perchlorate in drinking water, and making a corresponding change to the factors it considers in cleaning up Superfund sites, according to an EPA release.
"This is a sensible step for protecting public health and preserving regulatory options as the science of perchlorate is reviewed," said Benjamin H. Grumbles, EPA assistant administrator for water.
On Oct. 10, 2008, the agency issued a preliminary regulatory determination for public comment in the Federal Register. The notice described the agency's decision that there is not a "meaningful opportunity for health risk reduction" through a national drinking water regulation for perchlorate. The agency received more than 32,000 comments on the notice.
After considering public comments, as well as recommendations from EPA advisory groups and offices, the agency said it would like to ask the NAS to provide additional insight on various issues. Specifically, the EPA is asking the NAS to evaluate its derivation of the Health Reference Level of 15 ppb, the use of modeling to evaluate impacts on infants and young children, and the implication of recent biomonitoring studies. The agency is also asking the NAS how it should consider the role of perchlorate relative to other iodide uptake inhibiting compounds and if there are other public health strategies to address this aspect of thyroid health.
EPA is replacing the existing preliminary remediation goal of 24.5 ppb with the interim health advisory value of 15 ppb. This goal will be used as a consideration when establishing cleanup levels for perchlorate at Superfund sites.